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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef SPRINGTHREADING_H
#define SPRINGTHREADING_H
#define USE_FUTEX
#include <mutex>
#include <atomic>
#include <thread>
#include <condition_variable>
#if defined(_WIN32)
#include "System/Platform/Win/CriticalSection.h"
#elif defined(__APPLE__) || !defined(USE_FUTEX)
#include "System/Platform/Mac/Signal.h"
#elif !defined(__APPLE__) && defined(USE_FUTEX)
#include "System/Platform/Linux/Futex.h"
#endif
#if defined(__MINGW32__) && !defined(_GLIBCXX_HAS_GTHREADS)
#include "System/Platform/Win/Future.h"
#else
#include <future>
#endif
namespace spring {
#if defined(_WIN32)
typedef CriticalSection mutex;
typedef CriticalSection recursive_mutex;
typedef win_signal signal;
typedef std::condition_variable_any condition_variable;
#elif defined(__APPLE__) || !defined(USE_FUTEX)
typedef std::mutex mutex;
typedef std::recursive_mutex recursive_mutex;
typedef mac_signal signal;
typedef std::condition_variable condition_variable;
#elif !defined(__APPLE__) && defined(USE_FUTEX)
typedef spring_futex mutex;
//typedef recursive_futex recursive_mutex;
typedef std::recursive_mutex recursive_mutex;
typedef linux_signal signal;
typedef std::condition_variable_any condition_variable;
#endif
typedef std::thread thread;
namespace this_thread { using namespace std::this_thread; };
typedef std::cv_status cv_status;
typedef std::condition_variable_any condition_variable_any;
class spinlock {
private:
std::atomic_flag state;
public:
spinlock() {
state.clear();
}
void lock()
{
while (state.test_and_set(std::memory_order_acquire)) {
/* busy-wait */
}
}
void unlock()
{
state.clear(std::memory_order_release);
}
};
// barrier from http://stackoverflow.com/a/24465624
//XXX make this based on semaphores? condition_vars only wakeup one thread at a time on notify_all (check wiki)
class barrier
{
private:
mutex _mutex;
condition_variable_any _cv;
std::size_t _count;
public:
explicit barrier(std::size_t count) : _count(count) { }
void wait()
{
std::unique_lock<mutex> lock(_mutex);
if (--_count == 0) {
_cv.notify_all();
} else {
_cv.wait(lock, [this] { return _count == 0; });
}
}
};
}
#endif // SPRINGTHREADING_H
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